The Pickering and Stanton cartridges I saw on the jukeboxes were Mono, just like the music on those 45's. Some people claim it's better than stereo.
As i said earlier in this post High-End cartridges does not comes with a Jukebox, but it would be nice to have analog jukebox for free. Also Jukeboxes does not comes with High-End cartridges from Stanton/Pickering. In my opinion stereo is better than mono, 99% of my vintage 45s are stereo. I like stereo better than mono.
Sorry i've never tried a Koetsu, but if you will check the link below you will find comparison between Fidelity-Research FR-7 series versus Koetsu Coralstone. The price for FR-7f and even for FR-7fz (the best one) is still much cheaper than Koetsu.
Old thread: https://forum.audiogon.com/discussions/mc-cartridge-mini-shootout-spu-koetsu-fr-ikeda
And updates: https://forum.audiogon.com/discussions/fidelity-research-cartridges?highlight=fidelity-research%2Bcartridges